forked from arvitaly/go-graphql-tools
/
generator.go
371 lines (316 loc) · 9.34 KB
/
generator.go
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package tools
import (
"reflect"
"strings"
"unicode"
"github.com/arvitaly/graphql"
)
type Resolver interface {
IsResolve(sourceType reflect.Type, field reflect.StructField) bool
Resolve(FieldInfo, graphql.ResolveParams) (interface{}, error)
}
type Generator struct {
Types map[reflect.Type]graphql.Output
Resolver Resolver
}
func NewGenerator(resolver Resolver) *Generator {
generator := Generator{}
generator.Types = map[reflect.Type]graphql.Output{}
generator.Resolver = resolver
return &generator
}
func (generator *Generator) Generate(typ interface{}) interface{} {
return generator._GenerateGraphqlObject(typ)
}
func (generator *Generator) GenerateObject(typ interface{}) *graphql.Object {
return generator.Generate(typ).(*graphql.Object)
}
type FieldInfo struct {
Name string
Type reflect.Type
Tag reflect.StructTag
Source interface{}
Args interface{}
Path string
}
type _GetFieldsParams struct {
Source interface{}
SourceType reflect.Type
RootSource interface{}
RootSourceType reflect.Type
}
//Generate graphql fields and interface by fields of struct
func (generator *Generator) getFields(getFieldsParams _GetFieldsParams) (graphql.Fields, []*graphql.Interface) {
sourceType := getFieldsParams.SourceType
source := getFieldsParams.Source
var graphqlFields = graphql.Fields{} //init graphql fields
var graphqlInterfaces = []*graphql.Interface{}
for i := 0; i < sourceType.NumField(); i++ {
field := sourceType.Field(i)
//Get graphql tag for field
var sourceFieldGraphqlTag = field.Tag.Get("graphql")
////Exclude field
if sourceFieldGraphqlTag == "-" {
continue
}
//////
fieldType := field.Type
if field.Anonymous && sourceFieldGraphqlTag == "" {
graphqlFieldsExt, graphqlInterfacesExt := generator.getFields(_GetFieldsParams{
Source: reflect.ValueOf(source).Field(i).Interface(),
SourceType: fieldType,
RootSource: getFieldsParams.RootSource,
RootSourceType: getFieldsParams.RootSourceType,
})
for key, value := range graphqlFieldsExt {
graphqlFields[key] = value
}
for _, value := range graphqlInterfacesExt {
graphqlInterfaces = append(graphqlInterfaces, value)
}
} else {
sourceFieldGraphqlTagParams := strings.Split(sourceFieldGraphqlTag, ",")
var graphqlTagType string
if len(sourceFieldGraphqlTagParams) > 0 {
graphqlTagType = strings.ToLower(sourceFieldGraphqlTagParams[0])
}
//init new field
var graphqlField = &graphql.Field{}
//
var fieldName = field.Name
graphqlField.Type = generator.getGraphQLType(fieldType, graphqlTagType, fieldName)
if graphqlField.Type == nil {
continue
}
///Args
var argsI interface{} = nil
if method, ok := sourceType.MethodByName("ArgsFor" + fieldName); ok {
args := method.Func.Call([]reflect.Value{reflect.ValueOf(source)})[0]
graphqlField.Args = generator.getArgs(args)
argsI = args.Interface()
}
//Resolve check
if generator.Resolver != nil && generator.Resolver.IsResolve(getFieldsParams.RootSourceType, field) {
fieldInfo := FieldInfo{
Name: fieldName,
Type: fieldType,
Tag: field.Tag,
Source: getFieldsParams.RootSource,
Args: argsI,
Path: getFieldsParams.RootSourceType.Name() + "." + fieldName,
}
graphqlField.Resolve = func(p graphql.ResolveParams) (interface{}, error) {
return generator.Resolver.Resolve(fieldInfo, p)
}
}
graphqlField.Name = lA(fieldName)
descriptionTag := sourceType.Field(i).Tag.Get("description")
if descriptionTag == "-" {
graphqlField.Description = ""
} else {
if descriptionTag == "" {
graphqlField.Description = fieldName
} else {
graphqlField.Description = descriptionTag
}
}
if sourceFieldGraphqlTag == "interface" {
switch graphqlField.Type.(type) {
case *graphql.Interface:
graphqlInterfaces = append(graphqlInterfaces, graphqlField.Type.(*graphql.Interface))
break
default:
panic("Invalid interface for type " + sourceType.Name() + ", " + field.Name + " is not interface, " + graphqlField.Type.String())
}
} else {
graphqlFields[lA(fieldName)] = graphqlField
}
}
}
return graphqlFields, graphqlInterfaces
}
func (generator *Generator) _GenerateGraphqlObject(source interface{}) graphql.Output {
types := generator.Types
sourceType := reflect.TypeOf(source)
//get name
var name = sourceType.Name()
//get description
method, ok := sourceType.MethodByName("Description")
var description string
if ok {
description = method.Func.Call([]reflect.Value{reflect.ValueOf(source)})[0].Interface().(string)
} else {
description = name
}
//If type is interface
IsInterface := false
if method, ok := sourceType.MethodByName("IsInterface"); ok {
IsInterface = method.Func.Call([]reflect.Value{reflect.ValueOf(source)})[0].Interface().(bool)
}
//get fields
graphqlFields, graphqlInterfaces := generator.getFields(_GetFieldsParams{
Source: source,
SourceType: sourceType,
RootSource: source,
RootSourceType: sourceType,
})
config := graphql.ObjectConfig{
Name: name,
Description: description,
}
if len(graphqlFields) > 0 {
config.Fields = graphqlFields
}
if len(graphqlInterfaces) > 0 {
IsInterface = false
config.Interfaces = graphqlInterfaces
}
var obj graphql.Output
if IsInterface {
obj = graphql.NewInterface(graphql.InterfaceConfig{
Name: config.Name,
Fields: config.Fields,
Description: config.Description,
ResolveType: generator.ResolveType,
})
} else {
obj = graphql.NewObject(config)
}
types[sourceType] = obj
return obj
}
func (generator *Generator) ResolveType(p graphql.ResolveTypeParams) *graphql.Object {
return generator.Types[reflect.TypeOf(p.Value)].(*graphql.Object)
}
/**/
func (generator *Generator) getArgs(sourceValue reflect.Value) graphql.FieldConfigArgument {
args := graphql.FieldConfigArgument{}
sourceType := sourceValue.Type()
for i := 0; i < sourceType.NumField(); i++ {
field := sourceType.Field(i)
if !sourceValue.Field(i).CanInterface() {
continue
}
description := field.Name
descriptionTag := field.Tag.Get("description")
if descriptionTag == "-" {
description = ""
} else {
if descriptionTag != "" {
description = descriptionTag
}
}
args[lA(field.Name)] = &graphql.ArgumentConfig{
Type: generator.getGraphQLType(field.Type, field.Tag.Get("graphql"), field.Name),
Description: description,
DefaultValue: sourceValue.Field(i).Interface(),
}
}
return args
}
func (generator *Generator) getGraphQLType(fieldType reflect.Type, graphqlTagType string, fieldName string) graphql.Output {
types := generator.Types
fieldKind := fieldType.Kind()
var isNull = false
if fieldKind == reflect.Ptr {
isNull = true
fieldKind = fieldType.Elem().Kind()
fieldType = fieldType.Elem()
}
if graphqlTagType == "id" {
if isNull {
return graphql.ID
} else {
return graphql.NewNonNull(graphql.ID)
}
}
if graphqlTagType == "input" {
var configInput = graphql.InputObjectConfig{}
var inputType graphql.Output
switch fieldKind {
case reflect.Slice:
inputType = generator._GenerateGraphqlObject(reflect.New(fieldType.Elem()).Elem().Interface())
default:
inputType = generator._GenerateGraphqlObject(reflect.New(fieldType).Elem().Interface())
}
configInput.Name = inputType.Name()
configInput.Description = fieldName
inputFields := graphql.InputObjectConfigFieldMap{}
for key, value := range inputType.(*graphql.Object).Fields() {
inputFields[key] = &graphql.InputObjectFieldConfig{
Type: value.Type,
}
}
configInput.Fields = inputFields
typ := graphql.NewInputObject(configInput)
switch fieldKind {
case reflect.Slice:
if isNull {
return graphql.NewList(typ)
} else {
return graphql.NewNonNull(graphql.NewList(typ))
}
default:
if isNull {
return typ
} else {
return graphql.NewNonNull(typ)
}
}
}
if graphqlTagType == "enum" {
var configMap = graphql.EnumValueConfigMap{}
if method, ok := fieldType.MethodByName("Values"); ok {
res := method.Func.Call([]reflect.Value{reflect.New(fieldType).Elem()})
for _, key := range res[0].MapKeys() {
configMap[key.String()] = &graphql.EnumValueConfig{Value: res[0].MapIndex(key).Interface()}
}
}
typ := graphql.NewEnum(graphql.EnumConfig{
Name: fieldType.Name(),
Values: configMap})
if isNull {
return typ
} else {
return graphql.NewNonNull(typ)
}
}
kind := fieldType.Kind()
if kind == reflect.Struct {
if fieldObj, ok := types[fieldType]; ok {
return fieldObj
} else {
return generator._GenerateGraphqlObject(reflect.New(fieldType).Elem().Interface())
}
}
var graphqlType graphql.Output
switch kind {
case reflect.String:
graphqlType = graphql.String
case reflect.Int, reflect.Int32, reflect.Int64, reflect.Uint:
graphqlType = graphql.Int
case reflect.Float32, reflect.Float64:
graphqlType = graphql.Float
case reflect.Bool:
graphqlType = graphql.Boolean
case reflect.Slice:
t := generator.getGraphQLType(fieldType.Elem(), graphqlTagType, fieldName)
graphqlType = graphql.NewList(t)
default:
return nil
}
if !isNull {
return graphql.NewNonNull(graphqlType)
}
return graphqlType
}
func lA(s string) string {
a := []rune(s)
a[0] = unicode.ToLower(a[0])
return string(a)
}
func lU(s string) string {
a := []rune(s)
a[0] = unicode.ToUpper(a[0])
return string(a)
}